linux-ext4 - [Bug 14972] [regression] msync() call on ext4 causes disk thrashing

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Message-Id: <201001021319.o02DJOH1026291@demeter.kernel.org>
Date:	Sat, 2 Jan 2010 13:19:24 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14972] [regression] msync() call on ext4 causes disk thrashing

http://bugzilla.kernel.org/show_bug.cgi?id=14972


Theodore Tso <tytso@....edu> changed:

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                 CC|                            |tytso@....edu




--- Comment #2 from Theodore Tso <tytso@....edu>  2010-01-02 13:19:23 ---
Regression from what?  Ext3?  Or some earlier kernel version?

What arguments are you giving to this test program of yours?   It looks like it
does some number of reads and/or writes to the file, and then calls 10,000
msyncs with 50ms wait between each msync.

I'm not seeing any disk activity as a result.   Was anything else reading or
writing to the file or to the file system at the same time?

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